New GM Crops Could Make Superweeds Even Stronger

Herbicide-resistant superweeds threaten to overgrow U.S. fields, so agriculture companies have genetically engineered a new generation of plants to withstand heavy doses of multiple, extra-toxic weed-killing chemicals.

It’s a more intensive version of the same approach that made the resistant superweeds such a problem — and some scientists think it will fuel the evolution of the worst superweeds yet.

These weeds may go a step further than merely being able to survive one or two or three specific weedkillers. The intense chemical pressure could cause them to evolve resistance that would apply to entire classes of chemicals.